.\"	@(#)sum.1	6.1 (Berkeley) 4/29/85
.\"
.TH SUM 1 "April 29, 1985"
.AT 3
.SH NAME
sum \- sum and count blocks in a file
.SH SYNOPSIS
.B sum
file
.SH DESCRIPTION
.I Sum
calculates and prints a 16-bit checksum for the named file,
and also prints the number of blocks in the file.
It is typically used to look for bad spots, or
to validate a file communicated over
some transmission line.
.SH "SEE ALSO"
wc(1)
.SH DIAGNOSTICS
`Read error'
is indistinguishable from end of file on
most devices; check the block count.
